package com.liyunc.demo.config.manager;
/**
 * Copyright (c) 2018-2022 ThunderSoft
 * All Rights Reserved by Thunder Software Technology Co., Ltd and its affiliates.
 * You may not use, copy, distribute, modify, transmit in any form this file
 * except in compliance with ThunderSoft in writing by applicable law.
 */

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;

import java.util.Collection;

/**
 * @author
 * @version 1.0
 * @file
 * @brief
 * @details
 * @date 2022-02-25
 *
 * Edit History
 * ----------------------------------------------------------------------------
 * DATE                     NAME               DESCRIPTION
 * 2022-02-25                       Created
 */
@Service
public class MyAccessDecisionManager implements AccessDecisionManager {

    // decide 方法是判定是否拥有权限的决策方法，
    //authentication 是释CustomUserService中循环添加到 GrantedAuthority 对象中的权限信息集合.
    //object 包含客户端发起的请求的requset信息，
    // 可转换为 HttpServletRequest request = ((FilterInvocation) object).getHttpRequest();
    //configAttributes 为MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法
    // 返回的结果，此方法是为了判定用户请求的url 是否在权限表中，如果在权限表中，则返回给 decide 方法，
    // 用来判定用户是否有此权限。如果不在权限表中则放行。
    @Override
    public void decide(Authentication authentication, Object object,
                       Collection<ConfigAttribute> configAttributes)
        throws AccessDeniedException, InsufficientAuthenticationException {
        if (null == configAttributes || configAttributes.size() <= 0) {
            return;
        }
        String needRole;
        for (ConfigAttribute item : configAttributes) {
            needRole = item.getAttribute();
            for (GrantedAuthority authority : authentication.getAuthorities()) {
                if (needRole.trim().equals(authority.getAuthority())) {
                    return;
                }
            }
        }
        throw new AccessDeniedException("no right");
    }

    @Override
    public boolean supports(ConfigAttribute attribute) {
        return true;
    }

    @Override
    public boolean supports(Class<?> clazz) {
        return true;
    }
}
